Geodesic
Problemi Variazionali Plebei
Bollettino della Unione matematica italiana, Série 8, 10A (2007) no. 1, pp. 1-23

Voir la notice de l'article provenant de la source Biblioteca Digitale Italiana di Matematica

In everyday life we make some instintictive movements like walking, running, lifting ourselves with the arms, chewing, which, if carefully observed, can be mathematically described. And there are also some very primitive tools like hammer, can opener, scissors, knife, whose working yields non-trivial equations. In all these cases, the instinctive and empirical solutions satisfy an economy principle, which may be that of minimum effort or of minimum time of execution. 
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     author = {Villaggio, Piero },
     title = {Problemi {Variazionali} {Plebei}},
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Villaggio, Piero . Problemi Variazionali Plebei. Bollettino della Unione matematica italiana, Série 8, 10A (2007) no. 1, pp. 1-23. http://geodesic.mathdoc.fr/item/BUMI_2007_8_10A_1_a0/